Depends on the product and your reason for refusing to sell to a particular customer/group who is not against your TOS. This is not like there was a contract an

Depends on the product and your reason for refusing to sell to a particular customer/group who is not against your TOS. This is not like there was a contract and you decide not to extend. It sounds more like "I dont sell to gays anymore and I don't have to explain myself to you". Not cool. Especially if you rely on that product for your business. Even if your business is something like Shared.com.